Calling recipe[0] results in this error: AppDelegate.rb:157:in `[]': can't convert C/Objective-C value `0x8004676a0' of type `v' to Ruby object (ArgumentError)
I'm not sure what this means. I've played around with the Pointer class and I can get this error a lot. The original ObjC signature that is called to open the NSOpenPanel is: - (void)beginSheetForDirectory:(NSString *)path file:(NSString *)name modalForWindow:(NSWindow *)docWindow modalDelegate:(id)modalDelegate didEndSelector:(SEL)didEndSelector contextInfo:(void *)contextInfo Where the recipe (NSManagedObject_Recipe) is passed into a (void *)contextInfo. Do I need to do anything fancy for this? Is the (void *) causing the Pointer creation? On Wed, Dec 31, 2008 at 1:46 PM, Laurent Sansonetti <lsansone...@apple.com> wrote: > On Dec 30, 2008, at 7:32 PM, Nic Williams wrote: > >> In this code sample: http://gist.github.com/41855 I am getting a >> Pointer instance instead of an NSManagedObject_Recipe instance (from >> Core Data). Subsequently the setValue:forKey: call at the end of the >> delegate/callback method fails. >> >> The top method addImage(sender) launches an NSOpenPanel, which >> delegates to the second/last method >> addImageSheetDidEnd:returnCode:contextInfo: when the panel is closed. >> >> But instead of passing through the NSManagedObject_Recipe instance to >> the contextInfo: recipe value, I am getting a Pointer. >> >> Is this correct? Or how do I get my NSManagedObject_Recipe instance >> from the Pointer. MacRuby src for Pointer class doesn't suggest it has >> any methods for getting the pointed-to thing. >> >> rb_cPointer = rb_define_class("Pointer", rb_cObject); >> rb_undef_alloc_func(rb_cPointer); >> rb_define_singleton_method(rb_cPointer, "new_with_type", >> rb_pointer_new_with_type, 1); >> rb_define_method(rb_cPointer, "assign", rb_pointer_assign, 1); >> rb_define_method(rb_cPointer, "[]", rb_pointer_aref, 1); > > You can do pointer[0] to dereference it. > > A Pointer object can be created from a C array of elements, which is why > Pointer responds to #[] (so that you can dereference a particular slot). > > Laurent > _______________________________________________ > MacRuby-devel mailing list > MacRuby-devel@lists.macosforge.org > http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel > -- Dr Nic Williams iPhone and Rails consultants - http://mocra.com Fun with iPhone/Ruby/Rails/Javascript - http://drnicwilliams.com * Surf Report for iPhone - http://mocra.com/projects/surfreport/ * _______________________________________________ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
